The thylakoid proton antiporter KEA3 regulates photosynthesis in response to the chloroplast energy status

Michał Uflewski, Tobias Rindfleisch, Kübra Korkmaz, Enrico Tietz, Sarah Mielke, Viviana Correa Galvis, Beatrix Dünschede, Marcin Luzarowski, Aleksandra Skirycz, Markus Schwarzländer, Deserah D. Strand, Alexander P. Hertle, Danja Schünemann, Dirk Walther, Anja Thalhammer, Martin Wolff and Ute Armbruster ()
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Michał Uflewski: Wissenschaftspark Golm
Tobias Rindfleisch: Wissenschaftspark Golm
Kübra Korkmaz: Wissenschaftspark Golm
Enrico Tietz: Wissenschaftspark Golm
Sarah Mielke: Wissenschaftspark Golm
Viviana Correa Galvis: Wissenschaftspark Golm
Beatrix Dünschede: Ruhr University Bochum
Marcin Luzarowski: Wissenschaftspark Golm
Aleksandra Skirycz: Wissenschaftspark Golm
Markus Schwarzländer: Universität Münster
Deserah D. Strand: Wissenschaftspark Golm
Alexander P. Hertle: Wissenschaftspark Golm
Danja Schünemann: Ruhr University Bochum
Dirk Walther: Wissenschaftspark Golm
Anja Thalhammer: University of Potsdam
Martin Wolff: University of Potsdam
Ute Armbruster: Wissenschaftspark Golm

Nature Communications, 2024, vol. 15, issue 1, 1-13

Abstract: Abstract Plant photosynthesis contains two functional modules, the light-driven reactions in the thylakoid membrane and the carbon-fixing reactions in the chloroplast stroma. In nature, light availability for photosynthesis often undergoes massive and rapid fluctuations. Efficient and productive use of such variable light supply requires an instant crosstalk and rapid synchronization of both functional modules. Here, we show that this communication involves the stromal exposed C-terminus of the thylakoid K+-exchange antiporter KEA3, which regulates the ΔpH across the thylakoid membrane and therefore pH-dependent photoprotection. By combining in silico, in vitro, and in vivo approaches, we demonstrate that the KEA3 C-terminus senses the energy state of the chloroplast in a pH-dependent manner and regulates transport activity in response. Together our data pinpoint a regulatory feedback loop by which the stromal energy state orchestrates light capture and photoprotection via multi-level regulation of KEA3.

Date: 2024
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DOI: 10.1038/s41467-024-47151-5

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